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channelmaniac

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Posts posted by channelmaniac

  1. Posted

    ChannelManiac,

    the OP had a key out on the TI keyboards but I need a CoCo keyboard!

     

    I broke my original CoCo3 keyboard and got an IBM keyboard hooked up with a plug-in board from cloud-9 but I much prefer the CoCo keyboard :)

     

     

    OldSchoolRetroGamer,

    definitely keep the CoCo and both TI's :) You can load games directly into the CoCo from tape or your ipod via the casette port (easy to make a cable if you don't have one) and the baud rate is fast.

     

    Bummer... The keyboard I have sitting here is a melty CoCo 2 version, not the 3. Would be a good upgrade for a CoCo 1 tho.

  10. Posted · Edited by channelmaniac

    I'll be updating the instructions and kits I have on my site for the Dual BIOS mod... There are issues with some brands of EPROMs if you tie an address line directly to ground where they are sourcing the current to float the line high and the chips will get finger blistering hot then fail. The power and ground lines should connect each with a 220 to 330 ohm resistor.

     

    Upper most address line

    |

    |

    |

    Switch ------------- 330ohm------- ground

    |

    |

    |

    330ohm

    |

    |

    |

    +5v

  11. Posted

    I used to work for a grey market Apple repair depot back in the mid 90s called Contemporary Concepts. We had a dishwasher and used it to clean hundreds and hundreds of boards... and back when Apple had individual key switches on keyboards we cleaned the puke filled keyboards too. After the keyboards dried we'd lubricate the key switches and test them, replacing a couple of bad ones here and there...

     

    NO batteries. Hot water wash. Hot water rinse. NO santization sequence and NO heat dry. No soap either. Let the boards dry well (a day on DIP boards, 3 on SMT) and you are good to go.

     

    Heat dry WILL melt plastics. The radiant heat is too much for many of the softer plastics.

     

    Today when I work on arcade game boards I just use as hot of water as I can stand, a tooth brush, and some liquid dishwashing soap and scrub the hell out of 'em in the kitchen sink. I dry them in the oven at 170 degrees F for about 20 to 25 minutes and they come out sparkling clean and toasty. Be sure to use oven mitts!

     

    I just did a Neo Geo 2 slot board that came in VERY nasty looking. After cleaning it looked like new.

     

    RJ

  15. Posted

    I'd be shocked to see TI-99/4a systems selling for "a coupla hunnert"... If they do I have 3 or 4 in the box. :)

     

    I have an old TI-99/4 that I expect to sell for that price, but not the /4a.

     

    One of these days I'll assemble the mother load of TI stuff into a big tested lot and sell it. I have several /4a, one /4, 3 PEBs, disk drives, cartridges, disks, voice synths, and more. Enough to make one nicely loaded setup with a /4 and maybe one with a /4a. All that is missing is the TI branded monitor.

  16. Posted

    At the speed the CV runs at you can use 200ns, 150ns, 120ns, or 100ns DRAM just fine without any issues.

     

    Of course, it's best to have matching speed DRAMs but at that slow speed you can mix/match DRAM speeds and manufacturers with little issue.

     

    For the switch, you can pick up dielectric grease at any automotive store. It's used for installing spark plugs as a little bit in the boot keeps the boot from sticking to the plug so you can remove them without the wire pulling out of the boot. :) Little bits of boot sticking on the plug makes it difficult to get a socket it so you can remove it during troubleshooting or tune-ups.

  18. Posted

    Hey gang,

     

    Long time lurker here...

     

    I was wondering if anyone knew of a ROM or a cartridge that exists to do some bank testing on the ColecoVision mainboard? I have a RevF that appears to have been submerged in Coca-Cola or some other toxic abrasive yet the board still functions... mostly. It will load standard ColecoVision carts but nothing with a large memory footprint. So homebrew games like Mario Bros. will not load or play.

     

    I bought some ICs to replace bad memory (if that's the case) but I was wondering if there was a way to test the memory... I do have a way to burn a ROM if necessary. Of course, it might be a trace since it's all nice and bubbly but I still think it would be great to have a bank tester if there were such a thing.

     

    Thanks,

     

    -Madaracs

    Check this website out for some CV Mod Boards with full PDF instructions available. They also have a mod to replace the current +5v memory chips with memory chips that require less voltage... therefore of course less heat build up. Looks like some nice stuff, but I'll let you decide as my days of fiddling have long past.

     

    Has anyone else heard of this place or dealt with them?

     

    http://www.arcadecom....com/index.html

     

    Jim

     

    Hi Jim,

     

    That's my site. ;)

     

    Raymond

  19. Posted · Edited by channelmaniac

    OK,

     

    I was going through a box of surplus CPU boards and found a some items I don't have a need for and can't test, but thought that someone here would have an interest in.

     

    First up: Atari 800 CPU board with no chips, labeled "5" in black silkscreen. All part locations are in black silk screen and a hand written "000166" is on it. No idea if that's the serial # of the board... all the other CPU boards had white silk screen so this one stood out. It has "C014360 REV 1 ©79" on it.

     

    $5 on the empty CPU board

     

    SOLD: Second up: 3 x CO14887 - PAL ANTIC

    SOLD: Third up: 3 x CO14889 - PAL GTIA

    $2.50 each on the chips. As mentioned, I can't test them. They came off surplus boards that I bought > 70 of.

     

    Fourth up: Atari 800 Personality Board with all chips, labeled "4" in white silkscreen. Labeled C012989 REV E.

     

    $7.50 on the Personality Board.

     

    Fifth up: Some kind of Atari disk drive analog card. Labeled "CO17761 REV 4"

     

    $4.00 on the disk drive board.

     

    Plus shipping. I do take PayPal.

     

    Thanks!

     

    RJ

  22. Posted

    OK,

     

    I've had some of the 2600 cartridge slots sitting around in the filing cabinet here and just ran across them tonight again while cleaning. I don't want to throw them out so the first person to PP me a few dollars to cover shipping can grab 'em instead of them heading to the landfill.

     

    There are 8 of them. Some have the plastic cartridge guide and some don't.

     

    Thanks!

     

    RJ

  24. Posted

    How about 50/50 mix of type B and C for the 8-bit computer. Can you do PayPal?

     

    If you can, I'll PM my account name, then you could generate an invoice for me, and I can pay up straight away.

     

    A dozen or so should be sufficient - so, say ~ $24 worth in total including postage.

     

    Thanks for the PMs and the purchase.

     

    I still have plenty left!

  25. Posted

    How many of the type B and C (for the 800) boards do you have?

     

    I wouldn't mind getting hold of some, but not really worth it unless I could at least partly fill one of those $15 International mailers you guys can use... they hold around 16 populated 7800 boards, so should hold at least that many computer cart boards.

     

    I have over 200 of them combined... mostly the C boards. How many did you want to get? I can put them in a tyvek FedEx envelope and shove it in the USPS Priority Mail Flat Rate International envelope. That's $13.60 for all I can stuff in it (up to 4 pounds in weight)... and I should be able to stuff a bunch in it. :D

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